<!DOCTYPE html>
<!--
     Any copyright is dedicated to the Public Domain.
     http://creativecommons.org/publicdomain/zero/1.0/
-->
<html>
<head>
  <link rel="author" title="Daniel Holbert" href="mailto:dholbert@mozilla.com">
  <meta charset="utf-8">
  <style>
    .container {
      width: 100px;
      height: 20px;
      border: 5px solid black;
    }
    .container > * {
      height: 18px;
      float: left;
    }
    .itemA {
      width: 38px;
      background: purple;
      border: 1px solid indigo;
    }
    .itemB {
      width: 58px;
      background: teal;
      border: 1px solid lightblue;
    }
  </style>
</head>
<body>
  <div class="container">
    <div class="itemA"></div>
    <div class="itemB"></div>
  </div>
</body>
</html>